Hello! Advice for a newbie healer and new friends?

[Mimilu]

As a Conjurer and future White Mage, here are a few things:
-To unlock White Mage, you'll need to level Conjurer to 30 and Arcanist to 15. I would highly recommend you do this when you get Conjurer to 30 because White Mage will give you some great spells and abilities.
-At level 30, you'll get Cure II. Do NOT spam this, it will eat up your MP. Use it when someone in your party is at 50-60% HP or lower.
-At 50, you'll get Medica II. For this one, you want to use it once when the whole group gets hit then use Medica for any additional AoE healing, until Medica II's Heal-over-time effect wears off.
-At 38, you'll get Shroud of Saints. This will recover your MP. Use it when you're at 70-80% MP.
-I would highly recommend getting Thaumaturge to 26 so you can get Swiftcast, which will make one spell instant cast (great for using Raise)
-Once you feel acclimated to healing and think your party can survive for a little bit, you can turn Cleric Stance on and add some DPS (just be sure to turn Cleric Stance off when you need to heal).

[Mimilu]

-At level 30, you'll get Cure II. Do NOT spam this, it will eat up your MP. Use it when someone in your party is at 50-60% HP or lower.

Just to add one more thing:
-There is an exception to the no spamming Cure II rule: at level 32 you'll get a trait called Freecure that will give you a 15% chance whenever you use Cure, your next Cure II will be cost free. It will show up as a 15 sec buff on you. Use it. It will help your MP.